Brake



`@&. 23, w23.

H. w. CLARK BRAKE Filed Dec. '19 1921 www? 2 Sheets-Sheet A2 Patented @et 23, 1923i.

arras terrestr- HABOLD W. CLARK, OF ALLANCE, 01110, ASSGNGR TO THE ALLANCE IACHINE COMPANY, 0F ALLIANCE, OHIO, l1 CGRPOEATION OF 0R10. i

BRAKE. 1

Application led December ToaZZ whom it may concern.'

Be it known that 1, HAROLD 1V. CLARK, residing at Jilliance, in the county ci Stark and State oi' Ohio, have invented a new and usetul'lmprovement in Brakes, oi' which the following is a full, clear, and exact descri tion.

l y inventign relates to brakes of the type wherein shoes are pressed against a rotating drum, and is designed to' provide a brake of this character wherein substantially par'-V allel motion is given to the shoe or slices and substantially no strain is placed on the shaft carrying the brake drum. 1t is especially adapted for hoists and cranes wherein the shoes are operated magnetically, but may be used generally.

1n the accompanying drawings, which show two forms or" my invention:

Figure 1 is a plan View of the preferred torni;

Figure 2 is a longitudinal section on the -line 1li- H of Figure 1;

Figure 3 is a view similar to Figure 2, but showing a modied form; and

Figures 1 and 5 are detail perspective views of parts employed in the form of Figure 3.

1n the preferred form ot construction shown in Figures 1 and 2; 1, 1 are the side plates of a supporting trame, having tul-v crum pins or shafts 1 and 5 extending between and through their upper and lower portions. On the central parts ot these shafts 4 and 5 are mounted brake levers 2 and 8, which in the form shown are operatively connected with the plunger Z ot a solenoid 6. As shown, the lower lever 2 eX- tends through a slot in the lower part of the plunger and has a loose pin connection 8 therewith, while the lever 3 extends through a slot in the enlarged head of a pin 9 screwed into the upper end of the plunger and has a loose pivotal connection 10 there# with. y i

On the shafts 4 and 5 are also lmounted connectors 14, each comprising a pair of triangular shaped plates having attheir torward ends a set oi" adjusting holes, any one of which may be brought into registry with corresponding holes in the forwardly projecting end of its operating lever. and 13 designate the holesin Vthe levers, and 15, 16 and 17 the holes in the connectors. Each pair ot connectors embraces the correiii, i2

19, 1921. Serial No. 523,275,

sponding lever and is provided with pins connecting with the braking members 22 and 23. As shown, the pin 18 extends through the upper portions of the upper plates 14C and through the upper ends of the pair of bra-king members 22,while the lower pin 19 ot the upper plates extends through the upper ends of the braking members 23. Similarly, the pin 2O of the lower plates eX- tends through the lower end ot the braking members 22, while the lower pin 21 ot the lower plates extends through the lower end of the braking members 23.

Either the levers or the connectors should be loosely mounted on the pins or shafts i and 5 to allow any one of the holes in the levers to be brought into registry with the holes in the plates. 1n the tormshown, the end holes 13 are connected by pins with the end holes 17 but by removing this pin and swinging the plates slightly relative to the lever, any one of the holes may be brought into registry, thus giving an adjustment for wear. This is the main object of providing the link connections between the levers and the brakingimembers.

The brake shoes24 and 25 are secured between the pairs ot braking members 22 and 23, and their sur-faces, of course, conform to the surface of the brake drum 26, carried on the shaft 27. The distances from the center of the pin 5 and the centers or the pins 18 and 19 are preferably alike, and the same spacing is preferably used for the pins 1, 20 and21.

lin the iorm of Figures 3, e' and 5 the connecting links between the levers and the braking members are done away with, and adjustment is had by vscrew pins 28 and 9, screwed into the opposite ends ot the solenoid plunger. lThese pins may be screwed in and out, thus giving the desired adjustment for wear or otherwise. 1n this "form, the levers 2a and 3aA are lfulcrumed on the pins 4a and 5, and their forward ends are enlarged or provided with projections which are pinned directly to the ends of the pairs of brake members 22a and 23a. 1n these figures, parts shown in Figures 1 and 2 are designated by the same numerals with the letter a applied.

The operation or" my device is as follows: the operation ofthe device shown in Figures 1 and 2 being first explained'.

In the position shown in Figure 2, the

solenoid 6 is de-energizedand the armature has been moved bygravity toits loufermost position, and the brakes are applied by [the f weight ot the armature acting through the levers 2 and 3. K Y

TheV downwardmovement ot thearmature l 7 carries with it the ends of the brake levers 2 and 3, thereby rotating the levers 2 and and the members 1 4 around the pins e and This movement gives the'points '18, 19, 20-

' and 2l a counterclockwise movement. 'Ihe i points 18fand 20 being above the pin'scause'.

the brake member 2 2 and` the'brake shoe Y carried thereby toy move to the left, and the` Y. the points 19 and 2l are below the pins-5L;

brake member 23 andthe brakeshoe 25 ,cari ried thereby are moved to the r1ght,=s1nce Yand 5, respectively;Vv This movement causes bot-h brake shoes toI engage the surface ot the brake Vdrum and the brakes are therefore applied.' The equal movement ot the end'sV of the brake members 22 and 23 around the pins 4 and 5 moves the endsror" the brake 1 shoes 2ev and 25 an equal amount relative to L the brakeV drum. -The pinsll' and' are dia-V vmetrically opposite eachother and due to the arrangement illustrated, side strains on theshalit 27 carrying' the .brake drum, are avoided. f f

When it is desired to release thebrakes,

' thev solenoid 6 is energized, thus'raising the armature into engagementwith stop 30' and rotating the brake arms 2 and '3 in clockwise direction around the pins i-'and 5. This rotation'moves the brake shoes 241@ and' v25 away from the brake drum and thusV releasesv the brakes. The equal'l movement of both ends ot' the brake shoes'away fro'mthe drum avoids any drag ot the Vshoesron 'the drum. Y Y i After the brake has been in operation for some time, the 'brake shoes become worn and; in order for the shoes to gripthe drum sufiiciently, thearmature 7 mustmove't'o an un# desirableV downward position.l This condi- Vtion maybe remedied by Yadjusting therelative position ot'the members lfwith' respect tothe levers 2 and This adjustment'- Y is as follows:` j Y Y In order to tighten the'brakeathe con- `necting pins are removed from the holes 13 and the holes 16 in the members 14CV are brought into register 'with the'holes 12in the brake levers2 and 3; This causes a slight counter'clockwise rotation ofthe mem-v bers lli around the pins 4L and 5,"whi`ch it will be noted is inv al direction tol bringv theV brake shoes towardthe brakefdrum.` This brings the brake :shoes closer Ato' the brake drum with a given position' of' the brake vlevers 2 and 3 than was'the case when the connecting pins were in the holes 13.

In order to adjust the 'relation of the brake levers 2' and 3 fwth respect toeach other, the pin l0 is removed and the bolt 9 screwed into or out of the armature 7 to efect'th'e required adjustment. yOnce thisv adjustment is secured, yit remains fixed.

The operation ot' thedevice shown in :Figy ure 3 is identicalfwitli that above described. rIlleadjustment of the' brake shoes with re-V spect tov the'drum, however, is accomplished diferently from that of the device shown in Figures l and 2. In the device et Figure 3, this 'adjustment is Vaccomplished by removing'the pins 10L Vand 29 which 'connect' the brake levers 3a and 2a, respectively, 4vtothe armature-If zit is desired'to tighten-'the brakes for a given position` ot the armature *1nV 'the coil,the bolt9EL is screwedrinto the armature 7% andthe bolt 28K` is screwed out y 'ofy lthe armature alf corresponding amount. Y: I

"'Ihe brake levers 2 and 3a Vremain unchanged relative to yeach other, but areklowertorfa Y given position of the armaturein the coil,

thus'V moving the, brake Vshoe elc'ise to` the j drum.

By reason ot' the adjustments, the brakes sidefthe coil suiiiciently to be'quickly lifted Yare applied While the .armature remains in'- Y A to release the brakes when `the'coil is enerf gized and the adjustment is such that theV brakes are fully released when thearmature f has moved to its maximum upward position side strains'on the brake drumshajt't, ands1mp'le means are provided tor Vmaking theVVV Y necessary 'aidjustme1n3s-v Other advantages Vwill be apparent to those skilled in the art.

`Many changes may lbe made in the details of construction of lmy device, without de? parting from'the spirit of my invention.

I claim:

rality otbodily nrovablefbrake shoes, and actuating` means operatively connected torsaid shoes and maintaining the same Yequidistantly spaced from the center of said drum at all times and in concentric relation thereto, 'substantially as described.

V2. In a brake device, a brake drum, a yplu.- ralityvof bodily movable brake shoes," and ,pivotally mounted actuating 'means operai l. In a brake device,'a brake drum, plu- 'y tively connected to saidV shoes and maintaining the same equi/distantly spaced fromthe center of said drum at allV times and in con-I centric relation thereto, substantially las j described. i I

A 3. In a brake device, a brake drum, a plu'- rality `of bodily movable brake shoes, andi .130,7

actuating means pivotally mounted intermediate adjacent ends of the brake shoes and operatively connected thereto for maintaining said shoes equidistantly spaced `trom the center of said drum and in concentric relation thereto at all times, substan tially as described.

4. In a brake device, the combination of a bralre drum, a plurality of brake members extending around said drum, eccentric means connected to the adjacent ends of said brake members, and means actuating said eccentric means whereby an equal movement isV always simultaneously imparted to the ends of said drum members upon every movementv of said eccentric means, substantially as described.

5. ln a brake device, the combination of a brake drum, brake members encircling said drum, eccentric means pivotally mounted independently ot said members and connecting the adjacent ends thereof, and .means for actuating said eccentric means to cause an'equa angular movement of said brake members about the pivot points of said eccentric means, substantially as described.

6. ln a brake device, the combination oia brake drum, brake members encircling said drum, means connecting` the adjacent ends of said members together, said means having Xed pivotal mountings between the ends of said members, and means moving said connecting means around said mountings to simultaneously move said members v* radially toward and away from the drum,

substantially as described.

7. ln a brake device, the combination of a brake drum, two brake members encircling said drum, two substantially parallel members rotatable about iiXed axes and connecting the ends orn said brake members, and

means connecting and rotating said parallel members for actuating the brake members, substantially as described.

8.I ln a brake device, the combination of two brake members adapted to encircle a brake drum and having their ends in ad'- jacent relationship, an actuating lever pivoted between and independently of each pair of adjacent ends of said brake members and operatively connected thereto, and means for simultaneously actuating said levers to move said brake members toward or away from each other, substantially as described.

9. In a brake device, the combination of two brake members adapted to encircle a brake drum, rotatable means connecting the adjacent ends of said members and rotatable at all times about fixed axes, and actuating means for said connecting means, substantially as described.

10. ln a brake device, the combination of two brake members adapted to encircle a brake drum, rotatable meansI connecting the adjacent ends of said members, and rotatable at all times about Xed axes, and adjustable means between said connecting means and said actuating means, substantially as described.

1l. ln a brake device, the combination of brake members, brake shoes thereon, rotatable levers, each connecting the adjacent ends of said members and having a xed pivotal mounting therebetween, a solenoid armature interconnecting said levers, and a coil for actuating said levers through said armature, substantially as described;

12. ln a brake device, the combination of brake members pivotally interconnected at points substantially diametrically opposite, and means for always moving both ends of said members simultaneously and through equal angles, substantially as described.

13. ln a brake device, the combination of a brake drum, brake members operatively related thereto, brake shoes on said members, levers each connecting an adjacent end of said members, and each having a fixed pivotal mounting between said ends, poweroperated means connecting the free ends of said levers, andmeans for e'ecting relative adjustment of said levers, substantially as described.

ln testimony whereof I have hereunto set my hand.

HAROLD W. CLARK. 

